Portable spot welder



` March 29, 1949. c5. .1. KAUDER 2,465,880

PORTABLE SPOT WELDER Filed Sept. 8, 1948 INVENToR. GEORGE J., KAUDERAffi/Wifi? Patented Mar. 29, 1949 UNITED STATES PATENT OFFICE 2,465,880PORTABLE SPOT WELDER George J. Kauder, Brooklyn, N. Y. ApplicationSeptember 8, 1948, Serial No. 48,297

(Cl. 21S- 4) Claims.

This invention relates to new and useful improvements in a portableelectric spot Welder, and more particularly, the present inventionconstitutes an improvement oi the spot welder disclosed in my co-pendingapplication Serial No. 46,419 filed on August 27, 1943 under the titleof Portable spot-Welder.

More particularly, the present invention proposes the construction of aportable electric spot welder characterized by a transiormer having abody mounted on the iront end thereof and supporting a fixed electrodeand a movable electrode and integrally formed with a carrying handle andprovided with a slidably mounted handle connected with the movableelectrode arranged in a manner so that the electrodes may be movedtogether by simultaneously gripping the carrying handle and the slidablymounted handle and squeezing them together.

A further object of the present invention proposes constructing theiront body oi adjacent sections formed with aligned guideways for a nosepiece which mounts the movable electrode and which is integrally formedwith the slidably mounted handle in a manner so that the nose piece andslidably mounted handle may be engaged in position between the sectionsof the front body while assembling the same.

Still another object ol the present invention proposes mountingexpansion springs between the adjacent faces of the handles in a mannerto hold the handles in a separated condition in which the electrodeswill be spaced from each other.

It is a further obje-ct of the present invention to construct animproved portable electric spot Welder which is simple and durable andwhich can be manufactured and sold at a reasonable cost.

For further comprehension of this invention, and of the objects andadvantages thereof, reference will behad to the following descriptionand accompanying drawings, and to the appended claims in which thevarious novel features of the invention are more particularly set orth.

In the accompanying drawing iorrning a material part of this disclosure:

Fig. l is a side elevational view ci the portable electric spot welderconstructed in accordance with the present invention having portionsther-eci broken away to reveal interior construction.

`Eig. 2 is a iront elevational view of Fig. i, but with the iront endsoi the electrodes broken away.

Fig. 3 is a partial vertical sectional View taken on the line 3--3 ofFig. l. y

Fig. 4 is a partial vertical sectional View taken on the line 4-4 ofFig. 1.

Fig. 5 is a further partial vertical sectional view taken on the lineii-E of Fig. 1.

Fig. 6 is a perspective View of one cl the half sections per se oi thefront body.

Fig. 7 is a perspective View of the nose piece per se, but with themajor portion ol the slidably mounted handle broken away.

The portable electric spot Welder, according to the present invention,includes a transformer Ill made up of a plurality of laminations Il oisoit magnetic material forming the core of the transformer. Enclosedwithin the laminations IS there is a primary winding l2 made up oi arelatively large number of turns of wire. Also, enclosed within thelaminations II there is a secondary winding I3 formed of a U-shapedpiece of conductive material, and the secondary winding has its endsprojected from the front end of the transformer IB. As is generallyknown in the art, the windings I2 and I3 are suitably insulated fromeach other and from the laminations iI which make up the core oi thetransformer.

Mounted on the front end of the transformer lll, there is a front bodylli and located at the rear end of the transformer I0 there is a framel5. The transformer Il), the front body I4 and the frame I`5 are securedtogether by long bolts I6 which pass through the frame l5, thelaminations II forming the transformer and which threadedly engage thefront body I4. As clearly shown in Fig. 1, the heads of the bolts iiiproject beyond the back face ci the frame lll.

A hollow cap Il is positioned at the rear face oi the frame I5 and isprovided at its corners with enlarged internal bosses EB which areformed at their front ends with holes I9 which enclose the heads of thebolts I6, see the lower right-hand corner oi Fig. 1. Diametricallyopposite sides cf the frame I5 and the hollow cap Il are formed withaligned ears 2l] and bolts 'il are passed through the ears of the hollowcap I1 and threadedly engage the ears of the frame I5 securing the 5hollow cap Il to the frame I5.

A manually closable switch 22 is mounted upon a rear portion of thefront body I4 by several screws 23, only one of which is shown in l, andan electric wire 2t connects in series the switch Z2 and the primarywinding lf2 of the ransiormer l@ and source ol electrical energy teenergize the transformer when the switch 22 is manually closed. The endof the electric wire 24 extends from the hollow cap II at the backthereof and is provided with the usual plug 25 for insertion into theusual outlet re-ceptacle or other` source of electrical energy.

Further details of the foregoing parts, except for the iront body Illand the parts carried thereby, will not be given in this specificationas such parts are fully disclosed in my co-pending application referredto above.

The front body |15 is formed ci adjacent cast sections 23 substantiallyalike in formation and which abut each other along a verticallongitudinally extending contact line. The sections of the front bodylll are secured together by bolts 2'| which freely pass through openingsin one of the sections 26 and which threadedly engage complementarybosses E8 molded on the inside of the other section 25.

At the top, the front body i4 is formed with an inverted U-shapedcarrying handle 29 formed of adjacent handle sections 3i! integrallycast with each of the sections 2S forming the iront body i4. When thesections 26 of the front body are clamped together, the adjacent facesof the handie sections Si abut one another, as shown in 2, B and 5, toform the complete carrying handle 2t.

At the bottom, the front body i4 is formed with a forwardly extendinglip 3| formed with a semi-circular groove 32. A portion of the lip 3|.is formed with each section 26 of the front body i4 and each portion ofthe lip 3| is formed with a part of the semi-circular groove 32, seeFig. 6. The lip 9| mounts a iixed electrode 33 which has its front end33a bent upwards as shown in Fig. l.. The rear end of the fixedelectrode 33 is nested in the semi-circular groove 32 and a piece ofinsulation material 34 is interposed between the lip 3| and the rear endof the fixed electrode 33.

A metallic conductor strip 35 having a semicircular bottom face isengaged over the rear end of the fixed electrode 33 and has its rear endprojected beyond the rear end of the electrode 33, as shown in Fig. l.The projected rear end of the conductor strip 35 is secured to one ofthe projected front ends of the secondary winding i3 of the transformerI6, by means of a bolt 36. rThus, the electrical circuit to the xedelectrode 33 from the secondary Winding I3 is completed through theconductor strip 35.

Mounted in position over the top of the conductor strip 35 there is apiece of insulation material 31 which has its sides projected beyond thesides of the conductor strip 35, as shown in Fig. ll. Bo-lts 38 arepassed upwards from the bottom face of the lip 3| through openings 3|avand pass through the sides of the insulation material 34 and threadedlyengage the projected sides of the insulation material 31 securing thoseparts t0- gether with the rear end of the xed electrode securely clampedbetween the adjacent faces of the insulation material 34 and thesemicircular bottom face of the conductor strip 35.

The adjacent faces of the sections 26 of the front body |4 are formedwith guideways 39, see Fig. 6, beneath the front end of the carryinghandle 29 and closely adjacent the top of the front body |4. When thesections 26 are clamped together, the guideways 39 become aligned andslidably support the rear end of a nose piece 40 for vertical slidingmovements relative to the front body |4.

The front of the nose piece 46 is formed with a socket 4| in which thereis mounted the rear end of a movable electrode 42. The movable electrode42 has its front end 42a bent downwards towards the upwardly bent frontend 33a of the xed electrode 33, see Fig. 1. The nose piece 40 is formedwith slots 43 which extend radially from opposite sides of the socket4|. Bolts 44 pass freely through openings 45, see Fig. 7, formed in thematerial of the nose piece 40 above the slots 43 and threadedly engagethe material of the nose piece 40 below the slots 43 to be tightened tosecurely clamp the rear end of the movable electrode 42 in the socket 4|of the nose piece 4U.

An inverted U-shaped slidably mounted handle 46 is integrally formedwith the nose piece 40. The handle 46 has its front vertical arm 46integrally formed at its lower end with the nose piece 40 and slidablyextended through a vertical passage 41 formed partially within each ofthe sections 30 of the carrying handle 29, see Figs. 2, 3, 5 and 6. Theintermediate arm 4Gb of the slidably mounted handle 46 is horizontal anddisposed above the carrying handle 29. The rear vertical arm 46c extendsvertically downwards from the rear end of the intermediate arm '46'D andis slidably disposed in a vertical passage 48 formed partially withineach of the handle sections 30 of the carrying handle 29.

Means is provided for holding the carrying handle 29 and the slidablymounted handle 46 in a spaced position in which the ends 33aL and 42a ofthe xed electrode 33 and the movable electrode 42 will be spaced, asshown in Fig. l. This resilient means comprises expansion springs 49inserted between the adjacent faces of the carrying handle 29 and theslidably mounted handle 46. The expansion springs 49 are retained inposition by having their top ends engaged with studs 50 integrallymolded with the bottom face of the intermediate arm 4Gb of the slidablymounted handle and their bottom ends engaged with studs 5| integrallyformed with the carrying handle 29. As shown in Figs. 5 and 6, the studs5| are formed of adjacent semicircular stud sections integrally moldedwith each of the sections 26 of the front body I4.

Means is provided for connecting tha nose piece 46 to the other end ofthe secondary winding |3 to complete the electrical circuit from thesecondary winding to the electrodes and the material to be weldedbetween the ends 33EL and 42a of the electrodes 33 and 42. Theconnecting means comprises a flexible strip 52 of conductive material,see Fig. 1, having one end secured to the bottom face of the nose piece40 by a bolt 53. The other end of the flexible strip 52 is secured tothe other end of the secondary winding I3, by a bolt 54.

The switch 22 is illustrated as being mounted upon the front body I4 ata point remote from the carrying handle 29, so that one hand must beused for operating the switch while the other hand is used for squeezingthe handles 29 and 46 together. This location of the switch 22 has beenfound to eliminate accidental closings of the switch; however, ifdesired, the switch could be located upon a portion of the carryinghandle 29 or on the front body |4 more closely adiacent the carryinghandle so that one of the ngers of the hand used for squeezing thehandles 29 and 46 together may also be used to operate the switch 22.providing for one hand operation of the portable electric spot Welder.

While I have illustrated and described the preferred embodiments of myinvention. it is to be understood that I do not limit myself to theprecise constructions herein disclosed and the right is reserved to allchanges and modifications coming within the scope of the inventiondefined in the appended claims.

Having thus described my invention, claim as new, and desire StatesLetters Patent is:

1. In combination with a transformer having a primary winding and asecondary winding with ends projecting from the front end thereof, afront body mounted on the front end of the transformer, a fixedelectrode mounted on said body and connected to one end of the secondarywinding, said front body being formed with a guideway, a nose pieceslidably mounted in said guideway and connected with the other end ofthe secondary winding, a movable electrode mounted in said nose piece tomove towards and away from said fixed electrode as said nose piece ismoved relative to said front body, a carrying handle integrally formedwith said front body, and a slidable handle extending from said nosepiece and slidably projected through and from said carrying handle to begripped and squeezed with said carrying handle for moving said nosepiece relative to said front body.

2. In combination with a transformer having a primary winding and asecondary winding with ends projecting from the front end thereof, afront body mounted on the front end of the transformer, a fixedelectrode mounted on said body and connected to one end of the secondarywinding, said front body being formed with a guideway, a nose pieceslidably mounted in said guideway and connected with the other end ofthe secondary winding, a movable electrode mounted in said nose piece tomove towards and away from said xed electrode as said nose piece ismoved relative to said front body, a carrying handle integrally formedwith said front body, and a slidable handle extending from said nosepiece and slidably projected through and from said carrying handle to begripped and squeezed with said carrying handle for moving said nosepiece relative to said front body, said front body and carrying handlebeing formed of adjacent sections which abut each other along a verticallongitudinally extending contact line.

3. In combination with a transformer having a primary winding and asecondary winding with ends projecting from the front end thereof, afront body mounted on the front end of the transformer, a xed electrodemounted on said body and connected to one end of the secondary winding,said front body being formed with a guideway, a nose piece slidablymounted in said guideway and connected with the other end of thesecondary winding, a movable electrode mounted in said nose piece tomove towards and away from said fixed electrode as said nose piece ismoved relative to said front body, a carrying handle integrally formedwith said front body, and a slidable handle extending from said nosepiece and slidably projected through and from said carrying handle to begripped and squeezed with said carrying handle for moving said nosepiece relative to said front body, said front body and carrying handlebeing 'formed of adjacent what I to secure by United sections which abuteach other along a vertical longitudinally extending contact line, andmeans for releasably securing the sections of said front body together,said securing means comprising bolts passing through one of said frontbody sections and threadedly engaging complementary bosses formed on theother of said front body sections.

4. In combination with a transformer having a primary winding and asecondary winding with ends projecting from the front end thereof, afront body mounted on the front end of the transformer, a xed electrodemounted on said body and connected to one end of the secondary winding,said front body being formed with a guideway, a nose piece slidablymounted in said guideway and connected with the other end of thesecondary winding, a movable electrode mounted in said nose piece tomove towards and away from said nxed electrode as said nose piece ismoved relative to said front body, a carrying handle integrally formedwith said front body, and a slidable handle extending from said nosepiece and slidably projected through and from said carrying handle to begripped and squeezed with said carrying handle for moving said nosepiece relative to said front body, said slidable handle having portionsslidably extended through passages formed in said carrying handle.

5. A portable electric spot welder comprising a transformer having aprimary winding and secondary winding with the ends of said secondarywinding extending from the front end of said transformer, a front bodyformed of adjacent sections having aligned guideways, bolts passingthrough one of said sections and engaging complementary threaded bossesin the other of said sections securing said sections together', a fixedelectrode mounted on and insulated from said front body and connected toone end of said secondary winding, a nose piece slidably mounted in saidaligned guideways and connected with the other end of said secondarywinding, a movable electrode mounted in said nose piece to move towardsand away from said iixed electrode as said nose piece is moved relativeto said front body, a carrying handle integrally formed with said frontbody, and a slidable handle extending from said nose piece and slidablyprojected through and from said carrying handle to be gripped andsqueezed with said carrying handle for moving said nose piece relativeto said front body.

GEORGE J. KAUDER.

RE "ERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 2,211,551 Winkler Aug. 13, 19402,256,028 Jardine et al Sept. 16, 1941 2,267,297 Campbell Dec. 23, 19412,402,004 Adams June 11, 1946 2,441,438 Mulder May 11, 1948

